<div class="container">
    <div class="panel panel-danger">
        <div class="panel-heading"><h3>404错误</h3></div>
        <div class="panel-body">
            <h4>您所访问的路径不存在！</h4>
            <p><a location-back class="btn btn-primary btn-sm" role="button">返回</a></p>
        </div>
    </div>
</div>